You can easily hide and unhide columns in Excel by individually revealing hidden columns or using the "Format" option to unhide all hidden cells.

How to Remove Extra Unused Cells in Microsoft Excel 2013. Worksheets in Microsoft Excel can contain over a million rows and over 15,000 columns. With a workspace that large, if you're not careful ...

Open Microsoft Excel, then click "File" and open the document containing the named range you want to delete. Click the "Formulas" tab and click "Name Manager" in the Defined Names group.